Artificial tooth.



s. mymsow.v -AnTmciAL Tohru. APPLICATION FILED MAR. l0` lgl.

Pa-tnted une 27, 191,6.

, INVNTDSFQ: j SIMCIN NyERsmN I .ATTRNEXS- SIMON MYERSON, OF CAMBRIDGE, MASSA(l1-IU'S'TEiv ARTIFICIAL TOOTH.

il 'o ett y1li/1,0m t may concern:

Be it known that I, SIMON MrsRsoN, ,a citizen of the Unitedl States, residing ttt Cambridge, in the county of Middlesex and -State of Massachusetts, have invented new and useful.y Improvements in Artificial Teeth, ot which the following is a specifica.- tion. i.

This invention relates to an artificial tooth including removable or replaceable body portion of porcelain having a socket in its posterior portion, and a metallic .backing formed to bear on a posterior surface of the body and provided with a tenen 'formed to closely fit said socket, and cooperate with one end et the latter in resisting forces of masticatien. f

The chief object of the invention is to compensate. for the loss of strength and cross sectional. area of the body by invasion of its material due 'to-.the formation ofthe socket therein, without 'unduly increasing i the bulk of' the body.

f improvements The invention is embodied in a removable or replaceable tooth portion and a metallic backing therefor, formed to accomplish said object, the said removable portion comprisaporcelain Y,body and a metallic reim 'forcing n'ieii'iber'embedded in the posterior portion oi said body andy provided with a socket which is closed at one end and is open at the posterior surface ot the body, said reinforcing member compensating for the reduction ot the cross 'sectional areay of the body diie to its invasion by said socket, and being provided with anchoring means resisting strain tending to crack the body at vits anterior surface.

The invention is also embodied in other hereinafter described and claimed.

Of the'accompanying drawings formingv f sents a front view ot an incisor tooth ern-- bodying my invention; Fig. 2 represents a rear view ot' the same; Fig. 3 represents a section on line of Fig. 2; Fig. 4 represents a section on line ly-A ot' Fig. 2; Fig. 5 represents an enlarged rear view ot the reinforcing member; Fig. 6 represents an edge view .of the same; Fig. 7 represents a section on line 7--7 of Fig. 5; Fig. S represents a section. on line 8-8 ot Fig. 5; Fig. 9 ts a. sido view and Fig. 10 an edge the backing; Fig. 11 represents a e i 11 Fig. i); Fig. 12 rep- Svpeciceltion of Letters Patent. Patented June Application led March 10, 1916. Serial No. 83,9151.

resents a longitudinal section showing une body, reinforcing member and backin asf scinhled; Fig. 13 represents a section online i l,

'1B- 13 of Fig. 12;.Fig. 14 represents a rear view of a molar tooth body-embodying the" invention; Fig. 15 represents a sectionf on line 15-15 otFig. 14; Fig. 16 represents a section on line 16-16 of Fig. 14; Fig. 17 represents an edge. view of the molar body backing; F'g. 1S represents a section on line 18--18 of Fig. 17; Fig. 19 represents a longitudinal section showing the molar body, reinforcing body and backing assem-V bled. i Y

The same reference characters lindicate the same or similar part-s in all the views.

Referring first to Figs. 1 to 13 inclusive,

20 represents an incisor tooth body of porcelain, having a fiat posterior surface, and an inclined ridge lap. 21 represents a me'- tallic reintorcinfr member embedded in thev posterior portion of the body and provided with. a, longitudinal socket 22 which lis preferably longitudinally tapered and dove tailed as shown, said member having lateral flanges Hush with the lingualfface ofthe tooth body. The socket opens rearwardly on the lingual tace of the body, and'one of its ends opens on the inclined ridge lap, its

opposite end or that nearest the incisal edge et the body being closed and adapted to be seated on the tenen hereinafter described, said closed end being infeterably provided with a pit 23 cmistituting an extension of the inner portion of the socket toward the incisal edge.

ln practice the porcelain of the body is preferably molded on the reinforcing 1i1ember while in a plastic condition and is solidified thereon by baking. The reintorcf ing member is preferably. of dovetail form externally, as shown by Figs. 4, 8, and 13, so that it is engaged or intel-locked with the body against lateral separation.

The insert or reinforcing member is preferably provided with anchoring pins or projections 25 which engage the body to prevent displacement, said projections also aeting as. transverse straps increasing the strength of the body and its resistance to strain tendingto cause it tov crack between the relatori-ing member and the anterior surface of the body. l l

The socketed roinforci ng member embedded in the posterior portion of the body porcelain by the socket and enables the socket to be made of minimum depth, so that suitable strength is insured Without an objectionably large bulli 0r cross sectional area of the body.

27 represents a metallic backing formed to cover the posterior surface of thebody and providedv with a tenon 28 formed to closely fit the socket 22, and abut against the closed end thereof, one end of the tenon being preferably provided with an exten v sion 29 entering the socket pit 23, and cooperating with the dovetailed body of the tenon in preventing lateral 'displacement of the body.

The outer end of the tenon is inclined and fiush with the inclined base surface oit' the body, so that -it may be ground away or reduced therewith whenever this is necessary.

The tenon is insertible in the outer end of the socket and the reinforced body is therefore removable or replaceable by an end- Wise movement relatively to the backing and tenonr Figs. ll to 1S show the invention embodied in a molor tooth, 20 representing' the body, and 21a the reinforcing member incorporated therein, said member having a socket 22, the closed end of which is provided vvith a pit 23a.

The backing 27u has a tenon 2S formed to fit the socket, and a tenon extension 29 formed to enter the pit 23a.

By the term immovably embedded employed in the specification and claims is meant that the insert or reinforcing member is immovably fixed Within the porcelain tooth body, in any desired manner, preferably by embedding the same in the porcelain body before the latter is baked, and by the baking process causing the same to become substantially an integral immovable part of said body.

Having described my invention, l claim:

l. An artificial tooth comprising a porcelain body, an insert member immovably embedded in said body to reinforce the same, and provided with a socket closed at one end and having a rear opening extending to the lingual face oi' the body, said insert member having laterally extended anchoring portions embedded in the material forming' the body of the tooth.

2. An artificial tooth comprising a porcelain body, an insert member imn'iovably em! bedded in said body to reinforce the same and provided with a socket closed at one end and having a rear opening extending to the lingual face of the body, the opposite sides of said insert being provided with lateral anchoring pins immovably embedded Within the material forming said body and extending in opposite directions.

3. An artificial tooth comprising a porcelain body and a metallic insert immovably embedded in said body to reinforce the same, and provided with a socket which is closed at one end and is open at the lingual face oi the body.y the closed end of the socket being provided withy a pit` and a metallic backing having a tenon fitting said socket and abutting on the closed end thereof, said tenon having an extension entering said pit. i.

4. An artificial tooth comprising a orcelain body, an insert member embed ed in said body to reinforce the same, and provided with avsocket closed at one end and having a rear opening extending to the lingual tace ot the body, said insert member havingI immovably embedded lateral flanges Hush with the lingual iace of the tooth body.

An artificial tooth comprising a porcelain body, an insert member embedded in said body to reinforce the saine. and provided with a socket closed at on' end and having a rear openingr extending to the lingual face of the body. said insert member having lateral flanges flush with the lingual face oi the tooth body, and anchoring pins projecting laterally froin'the sides-of said insert member and embedded in the tooth body and spaced from said flanges.

An artificial tooth comprising a porcelain body having a fiat lingual face and a ridge lap. a metallic insert member enlbedded in the body to reinforce the same, said insert member being provided with a longitudinally tapered dovctailed socket which is closed at one end and open at the opposite end on said ridge lap. the socket also opening laterally on said lingual face, and a metallic backing formed to cover said lingual face and provided' with a longitudi naliy tapered dovetailcd tcnon fitting saidsockct, said tenen being insertible in the open end of the socket and formed to abut against the closed end thereof.

ln testimony whereof I have affixed my signature` SIMON MYERKSON. 

